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Method for Correcting Voltage-λ Characteristic Curve

A characteristic curve and voltage technology, applied in electrical control, machine/engine, fuel injection control, etc., can solve problems such as running frequency and achieve comprehensive adaptation, improve running frequency, and reduce fuel consumption.

Active Publication Date: 2019-12-17
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, diagnostics that rely on continuous lambda regulation may not be run as often as required by legislators at the beginning of the vehicle lifecycle

Method used

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  • Method for Correcting Voltage-λ Characteristic Curve
  • Method for Correcting Voltage-λ Characteristic Curve
  • Method for Correcting Voltage-λ Characteristic Curve

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Embodiment Construction

[0033] figure 1The technical surroundings are schematically shown, in which the method according to the invention can be applied. Combustion air is supplied to an internal combustion engine 10 embodied as an Otto motor via an intake duct 11 . In this case, the air quantity of the combustion air can be determined by means of an intake air measuring device 12 in the intake duct 11 . The delivered air quantity is used for determining the fuel quantity doped at the lambda value to be piloted and for determining the exhaust gas parameters, such as the exhaust gas quantity, the volume flow or the exhaust gas velocity. The exhaust gas of the internal combustion engine 10 is conducted through an exhaust duct 17 in which the catalytic converter 16 is arranged. Furthermore, a first lambda sensor 15 and a second lambda sensor 18 downstream of the catalytic converter 16 are arranged in the exhaust duct 17 upstream of the catalytic converter 16 , the The signal of the detector is fed to...

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Abstract

The invention relates to a method for correcting a voltage-lambda characteristic plot (36) of values from a two-point lambda sensor (15, 18) mounted in an exhaust passage (17) in an internal combustion engine by adjustment in the event of deviation from a reference voltage-lambda characteristic plot (35). Engine-independent adjustment for shifts in the characteristic plot of values from the two-point lambda sensor (36) is achieved because the adjustment is carried out while the engine is not running, and a temperature-dependent nominal value for the two-point lambda sensor (15, 18) is checked while heat is applied.

Description

technical field [0001] The invention relates to a method for correcting a voltage-λ characteristic curve of a two-point lambda sensor arranged in an exhaust gas channel of an internal combustion engine by adaptation in the event of deviations from a reference voltage-λ characteristic curve. Background technique [0002] In order to optimize the emission of pollutants in today's internal combustion engines, exhaust gas sensors are used to regulate the combustion process and exhaust gas aftertreatment, including double-point lambda probes and / or wide-band lambda probes. The optimization presupposes that the measured variable is ascertained reliably and accurately by the detector. The decisive factor here is the unambiguous correlation between the physically measured variable and the measured variable to be ascertained, usually present via the characteristic curve. A shift of the characteristic curve relative to the reference characteristic curve, for example due to tolerances...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/24
CPCF02D41/1455F02D41/1494F02D41/2474
Inventor M·费
Owner ROBERT BOSCH GMBH